unbuckles Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition verb. to release a buckle or fastening. Example Sentence He unbuckles his belt before sitting down for dinner. More Example Sentences They unbuckles their shoes at the door. Synonyms undo; unfasten; release Antonyms buckle; fasten; secure Hear It! Say It! Write It! unbuckles Switch to cursive Start Share with your friends: